Read the sentences. As a child, Thomas Edison asked an endless number of questions. His teachers found that he did not answer the questions they asked. Which shows the correct coordinating conjunction for combining the sentences? As a child, Thomas Edison asked an endless number of questions, or his teachers found that he did not answer the questions they asked. As a child, Thomas Edison asked an endless number of questions, and his teachers found that he did not answer the questions they asked. As a child, Thomas Edison asked an endless number of questions, so his teachers found that he did not answer the questions they asked. As a child, Thomas Edison asked an endless number of questions, but his teachers found that he did not answer the questions they asked.